221994 has 16 divisors (see below), whose sum is σ = 493440. Its totient is φ = 73980.

The previous prime is 221989. The next prime is 221999. The reversal of 221994 is 499122.

221994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221989) and next prime (221999).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (221999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2002 + ... + 2109.

It is an arithmetic number, because the mean of its divisors is an integer number (30840).

2²²¹⁹⁹⁴ is an apocalyptic number.

221994 is an abundant number, since it is smaller than the sum of its proper divisors (271446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221994 is a wasteful number, since it uses less digits than its factorization.

221994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4122 (or 4116 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 221994 is about 471.1623923872. The cubic root of 221994 is about 60.5499439603.

It can be divided in two parts, 22 and 1994, that added together give a triangular number (2016 = T₆₃).

The spelling of 221994 in words is "two hundred twenty-one thousand, nine hundred ninety-four".